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Access Restriction Bypass Affecting glibc package, versions <2.21-1

Severity

 Recommended
low

Based on Debian security rating

    Threat Intelligence

    EPSS
    0.18% (57th percentile)

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  • Snyk ID SNYK-DEBIAN11-GLIBC-528987
  • published 14 Mar 2016
  • disclosed 14 Mar 2016
Report a new vulnerability Found a mistake?

Introduced: 14 Mar 2016

CVE-2016-2856 Open this link in a new tab
CWE-264 Open this link in a new tab

How to fix?

Upgrade Debian:11 glibc to version 2.21-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc package and not the glibc package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk. NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.